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Yeah, big improvement after changing them. Didn't know the interval is 40K, oof.
It'll still misfire on multiple cylinders on 100% WOT at 4-5K RPM, but other than that it runs brilliantly. Feels perfect at 95%, but when I absolutely floor it, the issue re-occurs. My theory is the injectors are coked up. Given how nasty the spark plugs look, it's reasonable to think the injectors look the same on the outside. I'm running some fuel injector cleaner through to see if it'll fix the issue...
Oil: not sure actually.
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